Let ''f'' be a differential function such that 8f(x)+6f(1/x)-x =5 (x not equals to zero)and y=x.x(or x square) ,then dy/dx at x= -1 is:-1}-1/14 2}1/14 3}15/14 4}-15/14Please show only the solving method .

anurag bhattacharjee , 11 Years ago

Grade Upto college level